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Grading magnification
BLUEJAYWAY
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Having never submitted a coin for grading, what is the maximum power of magnification used by the grading cos. to determine their grade assignment? I suppose they could use a super powerful magnification level where even the most miniscule deformity could be detected. So at what level do they stop the mag. strength at?
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<< <i>Having never submitted a coin for grading, what is the maximum power of magnification used by the grading cos. to determine their grade assignment? I suppose they could use a super powerful magnification level where even the most miniscule deformity could be detected. So at what level do they stop the mag. strength at? >>
Most grading is done with the naked eye but a 5X is occasionally used to determine if a coin is "perfect" before a 70 grade is assigned. I'm sure they have stereo microscopes and an electron microscope available for authentication purposes.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
<< <i>
<< <i>Having never submitted a coin for grading, what is the maximum power of magnification used by the grading cos. to determine their grade assignment? I suppose they could use a super powerful magnification level where even the most miniscule deformity could be detected. So at what level do they stop the mag. strength at? >>
Most grading is done with the naked eye but a 5X is occasionally used to determine if a coin is "perfect" before a 70 grade is assigned. I'm sure they have stereo microscopes and an electron microscope available for authentication purposes. >>
Thank you for your response. When I wrote out the question I had temp. brain drain trying to remember electron microscope. Thanks for that reminder as well. If/when I go to submit any coins I want to pre-grade them, so I know what to look for based on the mag. level the grading services use. Then get a dealers opinion or opinions here.
You can click on the grading video and see the process. I also have heard it is a 5X loupe.
<< <i>You can click on the grading video and see the process. I also have heard it is a 5X loupe. >>
I did watch the video. This may have been commented prior, but I did notice w/in the video the graders handled the coinage w/o gloves,albeit on the edge. Is this proper procedure?
<< <i>
<< <i>You can click on the grading video and see the process. I also have heard it is a 5X loupe. >>
I did watch the video. This may have been commented prior, but I did notice w/in the video the graders handled the coinage w/o gloves,albeit on the edge. Is this proper procedure? >>
Yes, that is proper procedure
5x loupe is most common for graders; they usually use the wide field loupes. Some dealers I know who were past graders like a 7x, but 5x seems more common.
Partner @Gold Hill Coin
gloves are cumbersome and could lead to dropped coins.
These guys know what they are doing. Should they also be in space suits and have a sneeze guard?
<< <i>The likelihood of fumbling about and dropping coins makes gloves difficult to use. >>
Couldn't they just work over a padded surface?
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire